User Hans

12 votes

2 answers

499 views

"Pythagoras number" for integral matrices

asked Oct 13, 2015 at 8:24

10 votes

1 answer

596 views

Noetherian spectral space comes from noetherian ring?

asked Nov 10, 2018 at 18:05

10 votes

1 answer

410 views

Torsion points of abelian variety as zeros of a section of a vector bundle?

asked Dec 31, 2022 at 17:28

9 votes

1 answer

359 views

Relaxation of notion of positive definite function

asked Jan 9, 2022 at 16:10

9 votes

1 answer

256 views

Multiplicity of $Ext^{d-t}(M,\omega_R)$, ($d=\dim R, t=\dim M$)

asked Jan 23, 2015 at 19:21

8 votes

0 answers

307 views

Very ample divisors on blow ups of the projective plane

asked Sep 12, 2018 at 18:58

8 votes

1 answer

376 views

Invariant ring of $\textrm{Sym}^2(\wedge^2\mathbb{R}^4)$ under $\textrm{SO}(4)$

asked Jan 23, 2021 at 16:30

8 votes

1 answer

2k views

"Additive version" of Kronecker product

asked Sep 28, 2015 at 13:52

8 votes

2 answers

606 views

Structure theorem for artinian modules?

asked Nov 29, 2023 at 7:42

8 votes

1 answer

394 views

Smooth surfaces with defective secant variety

asked Nov 20, 2021 at 10:10

7 votes

1 answer

687 views

Are there journals for "fun mathematics"?

asked Dec 7, 2022 at 15:10

7 votes

0 answers

198 views

"Universal" polynomial of bounded norm on the sphere

asked Aug 31, 2020 at 10:35

7 votes

2 answers

659 views

Universal property of induced representation

asked Jun 15, 2020 at 16:49

7 votes

2 answers

847 views

Criterion for being reflexive via Ext

asked Jul 17, 2016 at 15:46

6 votes

5 answers

4k views

Package for the Closest Vector Problem (CVP)?

asked Dec 1, 2016 at 17:54

6 votes

3 answers

412 views

When can an $\mathfrak{S}_n$-equivariant map be extended to an $\textrm{O}(n)$-equivariant map?

asked Jun 24, 2020 at 16:51

6 votes

1 answer

216 views

Fixed space of maximal torus and Weyl group

asked Aug 7, 2020 at 9:27

6 votes

1 answer

626 views

Geometric interpretation of transfer map on homology

asked May 13, 2023 at 17:20

6 votes

1 answer

860 views

How many Fourier coefficients vanish?

asked Oct 17 at 8:01

5 votes

1 answer

267 views

Complete target and complete fibers imply complete source?

asked Aug 20, 2020 at 6:12

5 votes

0 answers

161 views

Hilbert scheme of real curves

asked Jul 8, 2020 at 10:06

5 votes

0 answers

152 views

Dimensions of faces of convex hull of convex bodies

asked Jan 31, 2018 at 12:27

5 votes

0 answers

125 views

Square of Generic Gorenstein ideal

asked Nov 14, 2019 at 20:47

5 votes

1 answer

786 views

Vector Spaces of Symmetric Matrices of Low Rank

asked May 16, 2014 at 13:35

4 votes

1 answer

354 views

When do we get free modules from Noether normalization

asked Jan 8, 2015 at 12:09

4 votes

1 answer

513 views

Being Cohen-Macaulay open in Hilbert scheme?

asked Aug 2, 2016 at 18:21

4 votes

0 answers

120 views

$\deg \mathcal{F}=\sum_{i=1}^r \textrm{rank}(\mathcal{F}|_{X_i}) \cdot \deg X_i$

asked Dec 2, 2015 at 15:15

4 votes

0 answers

104 views

Which linear forms are linear combinations of point evaluations?

asked Jun 19, 2021 at 11:11

4 votes

1 answer

244 views

Néron model, torsion and ramification

asked May 30, 2023 at 11:54

3 votes

0 answers

160 views

What does the Néron model of the dual abelian variety parametrize?

asked Jun 1, 2023 at 13:55

Stack Exchange Network

71 Questions

"Pythagoras number" for integral matrices

Noetherian spectral space comes from noetherian ring?

Torsion points of abelian variety as zeros of a section of a vector bundle?

Relaxation of notion of positive definite function

Multiplicity of $Ext^{d-t}(M,\omega_R)$, ($d=\dim R, t=\dim M$)

Very ample divisors on blow ups of the projective plane

Invariant ring of $\textrm{Sym}^2(\wedge^2\mathbb{R}^4)$ under $\textrm{SO}(4)$

"Additive version" of Kronecker product

Structure theorem for artinian modules?

Smooth surfaces with defective secant variety

Are there journals for "fun mathematics"?

"Universal" polynomial of bounded norm on the sphere

Universal property of induced representation

Criterion for being reflexive via Ext

Package for the Closest Vector Problem (CVP)?

When can an $\mathfrak{S}_n$-equivariant map be extended to an $\textrm{O}(n)$-equivariant map?

Fixed space of maximal torus and Weyl group

Geometric interpretation of transfer map on homology

How many Fourier coefficients vanish?

Complete target and complete fibers imply complete source?

Hilbert scheme of real curves

Dimensions of faces of convex hull of convex bodies

Square of Generic Gorenstein ideal

Vector Spaces of Symmetric Matrices of Low Rank

When do we get free modules from Noether normalization

Being Cohen-Macaulay open in Hilbert scheme?

$\deg \mathcal{F}=\sum_{i=1}^r \textrm{rank}(\mathcal{F}|_{X_i}) \cdot \deg X_i$

Which linear forms are linear combinations of point evaluations?

Néron model, torsion and ramification

What does the Néron model of the dual abelian variety parametrize?